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    <meta charset="UTF-8" />
    <title>09_案例练习-输入两个数，返回两个数字的和</title>
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<body>
    <script>
            // function f1(a,b){
            //     return a + b;
            // }

            // var a = f1(2,3);
            // console.log(a);

    </script>
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